Pioneer YN020GMFI22M2D Service Manual page 11

18. Power up the system, and run the indoor unit for
circuit A in COOLING mode to assure that all
functions are working.
19. Switch the indoor unit of circuit A to HEAT mode
and assure that all functions are working.
20. Set the temperature on remote to HIGHEST
setting and while the unit is running in heat
mode, check one last time for leaks at all 4
related pipe connections of circuit A. It is easier
to catch even smallest leaks in HEAT mode as
the pressures are much higher.
21. If you discover a leak that cannot be stopped by
tightening the flare nuts at this stage, shut off
both 2 way (liquid) and 3 way (Gas) service
valves, repair the leak properly and start from the
beginning. Please remember you may need to
add fresh refrigerant to the system as a
significant value may be lost at this stage.
22. REPEAT THIS ENTIRE PROCEDURE FOR
THE REMAINING CIRCUITS, B, C, D, E. Skip
if a circuit is not being utilized by an indoor
unit. In case an indoor unit is added in the
future, the same procedure should be
followed for that added circuit entirely.
5.4.3. Adding refrigerant if the pipe length
exceeds standard factory pre-charge amount:
Your system is pre-charged
refrigerant to work properly, according to an average
length of 7.5 meter (25 feet) piping for each of the
available circuits (example a 4 zone system can
have total piping length for all zones added together
of 30 meters (100 feet) max. If your total piping
length exceeds this limit, additional refrigerant must
be added to the system to compensate for the
difference.
Procedure:
PROCEDURE FOR 2, 4 AND 5 ZONE OUTDOOR
UNITS ARE DIFFERENT FROM 2 ZONE MODELS.
See Specific instructions below for each type as it
applies to your specific model.
1. For Dual (2 Zone) systems, connect the low
pressure hose on your gauge manifold (usually
blue) to the 3-way (Gas) valve's service port of one
of the occupied circuits (Circuit A preferred). See
below drawing.
2. For 3, 4 and 5 zone systems, connect the low
with sufficient
3. Connect the center hose of the gauge manifold
4. The air trapped in the gauge manifold and the
5. Determine the volume of the additional refrigerant
pressure hose from the gauge manifold set (this is
usually the blue hose on most sets) to the 3-way
(Gas) service valve of the Common (master) circuit.
See below drawing
(usually yellow) to the refrigerant container (this is
usually the yellow hose on most sets). Refrigerant
410A can only be charged in Liquid form while the
container must be inverted (upside down). Note
that all 2-way (Liquid) and 3-way (Gas) valves for
all "occupied" circuits where an indoor unit is
attached must be in the open position. Additionally,
for 3, 4 and 5 circuit models, the common (master)
2-way (Liquid) and 3-way (Gas) valves must also
be in open position.
hoses must be purged out. Use the pressure from
the system to purge the low side hose, by briefly
loosening its connection at the gauge manifold for
a second. Next, open the valve of the refrigerant
container to pressurize the center hose and loosen
the connector of the center hose at the gauge
manifold for a second and purge that line.
added into the system for the additional piping.